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Electron micrograph of the primary duct from non-extracted (0-day) Bothrops jararaca snake. BC (basal cell); DC (dark cell); M (mitochondrion); N (nucleus); SV (secretory vesicle); *—nerve terminal. (A) Secretory epithelium (pseudostratified) and DC; (B) Secretory cells with SV with different electrondensities and BC; (C) Mitochondria-rich cells.
